XOKTII AMr.KU'AX KAIII.V TKKTIAUY BUVOZOA. 



203 



FIG. 55. Subfamily Onychocellidae Jullien, 1881. 



A. Onychocella luciae Jullien, 1S81. Portion of zoarium, X 47. B. Onychocella morion Jul- 

 iien. 1SS1. Zooecia and onychocellaria, X 47. (A, B after Jullien.) 



C-G. Velumella levinseni Cauu and Bassler, 1917. C. Ovicelled zooecia, X 55. In the cover- 

 ing membrane of the aperture is seen a simple chitiuized opevculum, and in each of the two 

 sinuses of the aperture the end of a parietal muscle. D. Longitudinal section through the endo- 

 zooecial ovicell. E, F. Avicularium and mandible, X 40. G. A zooecial opereulum, above which 

 is an ooecial opereulum. (C-G after Leviusen, 1909.) 



H, I. Rectonychocella sot id a Nordgaard, 1907. Symmetrical mandible on the avicularium, 

 X 48. (After Nordgaard, 1907.) 

 J. Opercular valve of Onychocella luciae Jullien, 1SS1, X 47. 



K. Onychocella, angulosa Reuss, 1847. Mandible, X 85. (After Waters, 1885.) 



L. Opercular valve of Rectonychocella solida Nordgaard. 1907. 



SI. Microstructure of a nooecium of Diplopholeos lineatum, new species, X 100. 



N. Vacuolar microstructure of an old zooecium of Rectonychocella seniiluna, nc\v 

 species, X 25. 



</*, jicilypidian convexity. 



cry, cryptocyst. 

 ect, ectocyst. 



k, lunate chitinous mass. 

 me, corneous membrane. 

 mo, opercular muscles. 

 mr, elevator muscles of the mandible. 

 onio, passage of the occlusor muscles. 

 omr, passage of the elevator muscles of the 

 mandible. 



op, opesium. 



op, opercular valve. 



op, opesiular indentations. 



ov, ovicell. 



o/ior, opereulum of. the o\-icell, 



/)'/. pivot with denticles. 



c, rachis. 



x<:l, sclerite. 



r. vestibulum. 



